Chemistry 1
A reaction that feels cold is called what?
An endothermic reaction.
When two or more of the same atom are joined together chemically they have made an
element/Molecule
Is the water is a saltwater solution the solute or the solvent?
What is solvent?
---------- is known as the universal solvent
Water
Water is made of these two elements?
What is hydrogen and oxygen?
What reaction has reactants have more energy than products and they feel hotter?
What is Exothermic?
what chemical reaction do plants do to make food from sunlight?
photosynthesis
A substance formed by chemically combining two or more atoms of different elements is known as
Compound/molecule
The elements can be found in the far right group of the periodic table
What are noble gases?
Giving off heat or light is a clue that this type of a change is occuring.
What is a chemical change?
Neon and Argon are examples of
Noble Gases
What are the four variables that affect reaction rate?
What is Concentration, Surface Area, Temperature, and Catalysts?
What term refers to anything that occupies space, physical and chemical properties and exists in gas, liquid or solid form
Matter
Russian scientist who developed the periodic table
Mendeleev
The atomic number tells us this.
number of proton
There are this number of elements on the periodic table of the elements.
118
What do enzymes do?
Speed a chemical reaction
How does increasing temperature affect the movement of molecules?
What is molecules move faster?
Elements represent unique forms of these little thingies. The building blocks of everything!
What are atoms.
When one chemical changes its state of matter, the change is called
Physical Change
This is the smallest element
Hydrogen.
What is a valence electron?
The number of electrons on the outside of the atom.
Most of the periodic table is made of what?
metals
NaCl, FeS